Min. Also tschev-, and (after Ger. spelling) tschewkinite. [See quot. 1868 and -ITE1.] A rare mineral, a silicate containing titanium, iron, and the metals of the cerium group, occurring in velvet-black masses.
1850. Ansted, Elem. Geol., Min., etc., 443. Tschewkinite, silicate and titanate of cerium, lanthanum, and didymium, with oxide of iron.
1868. Dana, Min. (ed. 5), 387–8. Tscheffkinite…. Tschewkinit. G. Rose, Reis. Ural, ii. 1839…. From the Ilmen Mountains in the Urals; only a few specimens have been found…. Named after the Russian general, Tschevkin [Tshefkin].
